Baptism for salvation questions

These questions are for the Oneness folks who believe that without the correct baptism "In the name of Jesus" there is no salvation.

If "Jesus name" baptism is the only baptism to be saved.....


1. what happens to all the people that lived and died before 1913 when the Jesus name baptism "reemerge" in modern times?

2. why was this saving baptism hidden from the world, if its the only baptism that can save us?

Thank you in advance.